The hyponychium is the thickened skin under the free edge of the nail, where the nail plate separates from the fingertip. It forms a seal that keeps germs and dirt from getting under the nail.
| Location | Beneath the free edge of the nail plate, at the tip of the finger or toe |
|---|---|
| Parts |
|
| Nerve Supply | Digital nerves |
| Blood Supply | Digital arteries |
| Venous drainage |
|
| Lymphatic drainage |
|
Seals the space beneath the nail against infection.
Aggressive cleaning under the nail damages the seal and leads to nail lifting (onycholysis) and infection. Subungual melanoma and squamous cell carcinoma can appear here.
Separation of the nail from the bed beginning at the free edge.
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